Prescott 800 is not a motherboard model number, it's a chipset that was used on hundreds of motherboards including some made by Asrock. You need to provide the actual Asrock motherboard model if you expect anyone to help.

If you're unable to do so, then I suggest using this program:

To find make and model of pc hardware, EVEREST Home Edition is a free system diagnostics, system information program that will id

most hardware onboard a mb. as well as the actual motherboard. It will, in some cases, actually provide a download link for the driver.